From owner-freebsd-bugs@FreeBSD.ORG Wed Dec 11 06:10:00 2013 Return-Path: Delivered-To: freebsd-bugs@smarthost.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [8.8.178.115]) (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id EBA9F8C7 for ; Wed, 11 Dec 2013 06:10:00 +0000 (UTC) Received: from freefall.freebsd.org (freefall.freebsd.org [IPv6:2001:1900:2254:206c::16:87]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mx1.freebsd.org (Postfix) with ESMTPS id ADC9619D3 for ; Wed, 11 Dec 2013 06:10:00 +0000 (UTC) Received: from freefall.freebsd.org (localhost [127.0.0.1]) by freefall.freebsd.org (8.14.7/8.14.7) with ESMTP id rBB6A0wI079362 for ; Wed, 11 Dec 2013 06:10:00 GMT (envelope-from gnats@freefall.freebsd.org) Received: (from gnats@localhost) by freefall.freebsd.org (8.14.7/8.14.7/Submit) id rBB6A0TV079361; Wed, 11 Dec 2013 06:10:00 GMT (envelope-from gnats) Resent-Date: Wed, 11 Dec 2013 06:10:00 GMT Resent-Message-Id: <201312110610.rBB6A0TV079361@freefall.freebsd.org> Resent-From: FreeBSD-gnats-submit@FreeBSD.org (GNATS Filer) Resent-To: freebsd-bugs@FreeBSD.org Resent-Reply-To: FreeBSD-gnats-submit@FreeBSD.org, Richard Kojedzinszky Received: from mx1.freebsd.org (mx1.freebsd.org [8.8.178.115]) (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id 8182D7D0 for ; Wed, 11 Dec 2013 06:02:14 +0000 (UTC) Received: from oldred.freebsd.org (oldred.freebsd.org [IPv6:2001:1900:2254:206a::50:4]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.freebsd.org (Postfix) with ESMTPS id 6CC2D1959 for ; Wed, 11 Dec 2013 06:02:14 +0000 (UTC) Received: from oldred.freebsd.org ([127.0.1.6]) by oldred.freebsd.org (8.14.5/8.14.7) with ESMTP id rBB62D7W073817 for ; Wed, 11 Dec 2013 06:02:13 GMT (envelope-from nobody@oldred.freebsd.org) Received: (from nobody@localhost) by oldred.freebsd.org (8.14.5/8.14.5/Submit) id rBB62D3v073800; Wed, 11 Dec 2013 06:02:13 GMT (envelope-from nobody) Message-Id: <201312110602.rBB62D3v073800@oldred.freebsd.org> Date: Wed, 11 Dec 2013 06:02:13 GMT From: Richard Kojedzinszky To: freebsd-gnats-submit@FreeBSD.org X-Send-Pr-Version: www-3.1 Subject: kern/184677: ZFS snapshot umount kernel panic X-BeenThere: freebsd-bugs@freebsd.org X-Mailman-Version: 2.1.17 Precedence: list List-Id: Bug reports List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 11 Dec 2013 06:10:01 -0000 >Number: 184677 >Category: kern >Synopsis: ZFS snapshot umount kernel panic >Confidential: no >Severity: non-critical >Priority: low >Responsible: freebsd-bugs >State: open >Quarter: >Keywords: >Date-Required: >Class: sw-bug >Submitter-Id: current-users >Arrival-Date: Wed Dec 11 06:10:00 UTC 2013 >Closed-Date: >Last-Modified: >Originator: Richard Kojedzinszky >Release: stable/10, releng/9.2 >Organization: >Environment: FreeBSD freebsd10 10.0-PRERELEASE FreeBSD 10.0-PRERELEASE #9 57a89d6(stable/10)-dirty: Mon Dec 9 11:11:30 CET 2013 root@freebsd10:/usr/obj/usr/src/sys/BSD amd64 >Description: Accessing ZFS snapshots and unmounting them parallell causes the system to panic. In a real server setup, where unix users exists, they are able to access .zfs/snapshot/ directories, which causes snapshots to be mounted. The system may be set up to clean those mounts, umount them at some time. Then a panic may occur. >How-To-Repeat: Run the script at http://pastebin.com/Bf15sMhd on an empty ZFS dataset with a snapshot. >Fix: >Release-Note: >Audit-Trail: >Unformatted: